The population of Rui’an is so rapidly as to cause concern of the whole country.
A. expanding
B. exploring
C. extending
D. spreading
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(答案→)A. expanding
B. exploring
C. extending
D. spreading
解析：本题考查动词辨析。expand不仅指尺寸的增加，还可指范围和体积的扩大。stretch一般指由曲变直、由短变长的伸展；extend指空间范围的扩大或长宽的向外延伸，也可指时间的延长；spread一般指向四面八方扩大或传播。